fix(#148): remove outdated dependency on importlib-metadata (#149)

Author: daylinmorgan

setup.cfg

@@ -36,8 +36,6 @@ install_requires =
     jupyter_core
     shiny>=0.6.1.9005
     python-dateutil>=2.8.2
-    # Needed because of https://github.com/python/importlib_metadata/issues/411
-    importlib-metadata>=4.8.3,<5; python_version < "3.8"
 tests_require =
     pytest>=3
 zip_safe = False